Posted by GregCO on August 15, 2014 at 19:43:17 from (69.35.184.185):
In Reply to: Re: E15 experiment posted by Bob on August 14, 2014 at 21:56:02:
Hi, Bob, When I first bought this machine from day one I was experiencing problems with dieseling at shutdown as well as pre-ignition at start up when it was hot. It would rattle and kick back hard on a hot start. First thing I thought was there was a timing issue going on so I took it back to the Deere dealer to have it checked out. When I picked it back up they said they didn't find anything wrong with timing or fuel delivery, but did caution me on not running at least 91 octane in it. I found it hard to believe that an industrial engine needed that kind of fuel especially at high altitude. Most engines loose their need for high octane fuel as the altitude goes up and we are pretty high.
Anyway, I played around with this thing and found that if I ran 85 or 87 in it I would continue to have issues with shutdown and hot starts and bent push rods because of the dieseling problem. If I ran 91 things were fine.
So, I guess my answer to your question is from my experience it needs somewhere in the neighborhood of 90 to stop damaging things and run right.
Why? I got really tired of replacing push rods as it was bending one every couple of weeks in the summer during mowing season. At first I thought it was just a tight valve guide binding them up, but it was never the same one twice in a row. It has bent every one of them multiple times at one time or another and only when I was running anything less than 91 for fuel.
So, since everything else on the place runs fine on 85 including our vehicles I keep a little E85 around just to doctor the gas that goes into this machine. So far the alcohol has not caused any issues that I can find. I did finally have to rebuild the carb this spring as the accelerator pump split and an O ring cracked, but it is 10 years old now and was probably due anyway at 510 hours running time.
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